Two major U.S airlines say they will no longer accept rechargeable battery shipments as new government tests confirm that explosions and violent fires are likely to occur when large numbers of batteries enclosed in cargo containers overheat.

The Food and Drug Administration is warning doctors against over-prescribing testosterone-boosting drugs for men, saying the popular treatments have not been established as safe or effective for common age-related issues like low libido and fatigue.

NBC Universal is in talks to bring back Andrew Lack to its troubled news operation, which would be the first high-level shake-up following several rough months culminating in the six-month suspension of "Nightly News" anchor Brian Williams for misleading viewers about his experiences covering the Iraq War.

A unanimous Supreme Court ruled Tuesday that federal courts can hear a dispute over Colorado's Internet tax law. One justice suggested it was time to reconsider the ban on state collection of sales taxes from companies outside their borders.

Top business executives are pressing Congress to give President Barack Obama greater authority to negotiate international trade deals, citing the potential for increased hiring in the United States and greater competitiveness for their companies overseas.

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